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	The Sequence VIII procedure evaluates a lubricant's performance for resisting copper-, lead-, or tin-bearing corrosion and measures viscous shear stability during high-temperature operating conditions using unleaded fuel.

The Sequence VIII procedure evaluates a lubricant’s performance for resisting copper-, lead-, or tin-bearing corrosion and measures viscous shear stability during high-temperature operating conditions using unleaded fuel.

The Sequence VIII test is required for API categories:

• API SJ

• API SL

• API SM

Sequence VIII Test Equipment and Procedure

A 42.5-cubic inches of displacement (CID) carbureted, single-cylinder, spark-ignition, Cooperative Lubricant Research (CLR) oil test engine is operated with an external oil heater circuit.

The engine runs continuously for 40 test hours. Test speed is 3,150 rpm. Oil temperature is raised to 143 °C (290 °F) using an external oil heater.

Sequence VIII Test Results

At the end of the test, the following are evaluated:

• The connecting rod bearing weight loss is measured.

• Used lubricant is analyzed for kinematic viscosity.

• Multigrade oils require 10-hour stripped viscosity.

Sequence VIII Pass/Fail Criteria

Pass/fail criteria are:

• 26.4 weight loss maximum

• Stripped viscosity must stay in grade

For more information about the Sequence VIII procedure, or how you can contract with Southwest Research Institute (SwRI), please contact Fred Gerhart at fgerhart@swri.org  or (210) 522-3842.

sequenceviii.swri.org

| Engine Lubricants Research Department | Fuels and Lubricants Research Division | SwRI Home |

Southwest Research Institute^® (SwRI^®), headquartered in San Antonio, Texas, is a multidisciplinary, independent, nonprofit, applied engineering and physical sciences research and development organization with 11 technical divisions.

December 28, 2012